I fly a Mustang 2 with the big flap that goes under the belly and it is very effective. Like the KR, the M2 has stub wings that are not very long so the flap under the belly adds a lot of flap area. Basically what you get are a split flap under the fuselage and conventional flaps outboard the fuselage.
My first KR did not have a flap or a belly board and it did float a lot on landings, but I got used to it. Never flew one with flaps or a belly board. On the second KR I was building I extended the stub wings and I was going to have flaps. They were going to be hinged off the rear spar instead of the much smaller plans built design that only gave a chord about 8-10" IIRC. The reason they had such a small chord is because they would drag on the ground with the short retractable gear. -------- Original Message -------- Subject: KR> Speed Brake/Split Flap From: Mike Stirewalt via KRnet <krnet at list.krnet.org> List-Post: krnet@list.krnet.org Date: Sat, November 05, 2016 9:33 am To: krnet at list.krnet.org Cc: laser147 at juno.com Like the Mustang II has. I've got some great pictures . . . somewhere . . . of the MII's split flap that I took at French Valley a couple years ago. It's an excellent idea.
